"A measure taken to prevent or treat disease or to improve health in other ways.
The term is used to describe the process or action that is the focus of a clinical trial. Examples of interventions include vaccines, drugs, medical devices, and palliative care."
An activity or set of activities aimed at modifying a process, course of action or sequence of events, in order to change one or several of their characteristics such as performance or expected outcome.
World Health Organization. European Observatory on Health Systems and Policies. Glossary. 2009.